The difference between off-grid and grid-connected
The principle of off-grid photovoltaic power station is to store solar power to the battery, and then converted to 220V/380V through the inverter for home use. Grid-connected photovoltaic power station and the grid connected together, and no electrical energy storage devices, directly through the inverter into the national grid needs voltage requirements, and priority for home use, surplus electricity can also be sold to the state, to gain revenue.
Photovoltaic off grid system components
PV modules, off grid inverters (including PV chargers/inverters), energy storage batteries (lead-acid/colloid/lead carbon/tertiary lithium/ lithium iron phosphate and other types), PV brackets, cables, and distribution boxes are all important components of the PV off-grid system. The biggest difference between off-grid PV systems and grid-connected systems is that grid-connected systems are based on the premise of investment income, while off-grid systems are based on the basic need for power supply, so they will have a different focus in the selection of components.
Whether off-grid power plants should be equipped with batteries?
Off-grid photovoltaic power station is also known as independent photovoltaic power station, is not dependent on the grid and independent operation of the power generation system, mainly by solar panels, solar batteries, charge and discharge controller, inverter and other components. The working principle is that the electricity from the solar panel flows directly into the battery and is stored. When it is needed to power an appliance, the DC current from the battery flows through the inverter and is converted into 220V AC power, so that it can be used by the user.
This kind of power generation system is not restricted by geographical area and has a wide range of applications. It can be installed and used wherever there is sunlight, so it is very suitable for remote areas without grid, isolated islands, fishing boats, outdoor breeding bases, etc. It can also be used as emergency power generation equipment for areas with frequent power outages.
Off-grid power station system must be equipped with batteries (battery cost occupies 30-50% of the cost of the power generation system, and the service life of the battery is generally 3-5 years, the cost is relatively high), so from the economic point of view, it is difficult to promote the use of the system on a large scale, and it is not very meaningful for the areas with convenient electricity.
However, the system has a strong practicality for households in areas without a grid or in areas with frequent power outages. In particular, it is very practical to use DC energy-saving lamps simply to solve the problem of lighting during power outages. Thus, off-grid power generation systems are specifically designed for use in areas without a grid or in places with frequent power outages.
We stock two versions of off grid solar power inverters to compelet your PV project. One version is a multi-function inverter / charger from 700 watt to 6000 watt, 12V/ 24V/ 48V DC input to 120V/ 220V/ 230V AC output, combining functions of inverter, and battery charger to offer uninterruptible power support with portable size. Another version is three phase pure sine wave inverter with high power from 8kW to 200kW, no battery storage design, smart LCD display setting, powerful protection functions. View competitive prices of our off grid inverters online and start your ordering.
